Name
sincos, sincosf, sincosl - calculate sin and cos simultaneouslyLibrary
Math library ( libm ", " -lm )Synopsis
"#define(7)_GNU_SOURCE" " /* See feature_test_macros */" #include <math.h> void sincos(double " x ", double *" sin ", double * cos );
void sincosf(float " x ", float *" sin ", float * cos );
void sincosl(long double " x ", long double *" sin ", long double * cos );
Description
Several applications need sine and cosine of the same anglex
. These functions compute both at the same time, and store the results in *sin and *cos
. Using this function can be more efficient than two separate calls to sin(3) and cos(3). If x is a NaN, a NaN is returned in *sin and *cos
.
If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned in *sin and *cos
.
Return Value
These functions returnvoid
. Errors
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.The following errors can occur:
Domain error: x is an infinity errno is set to EDOM (but see BUGS). An invalid floating-point exception ( FE_INVALID ) is raised.
Attributes
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
T} | Thread safety | MT-Safe |
Standards
GNU.History
glibc 2.1.Notes
To see the performance advantage of sincos() it may be necessary to disable gcc(1) built-in optimizations, using flags such as:cc -O -lm -fno-builtin prog.c